Brent crude oil prices drop by $4 a barrel in 4 days: This is the biggest reason behind plunge

Oil prices fell further on Monday, pulled down by an expectation that producer club OPEC and its allies will increase supplies. Brent crude futures, the international benchmark for oil prices, were at $73.05 per barrel at 0036 GMT, down 39 cents, or 0.5 percent, from their last close.

U.S. West Texas Intermediate (WTI) crude futures were at .24 a barrel, down 82 cents, or 1.3 percent, from their last settlement. (Image: Reuters)